{% block top %}
    <!doctype html>
    <head>
        <meta charset="utf-8">
        <title>{{ title }}</title>
        <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.5.0/css/bootstrap.min.css">
        <link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/5.13.1/css/all.min.css">
        <script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.min.js"></script>
        <script src="https://cdn.staticfile.org/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>
        <script src="https://cdn.staticfile.org/font-awesome/5.13.1/js/all.min.js"></script>
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
{% endblock top %}
{% block content %}
{% endblock content %}
{% block bottom %}
    {% if beian != "" %}
        <div class="text-center">
            <a href="http://beian.miit.gov.cn" style="color: black">{{ beian }}</a>
        </div>
    {% endif %}
{% endblock bottom %}